Pipe assembly-heat exchanger-steam drum unit

Abstract

A pipe assembly-heat exchanger-steam drum unit, which comprises a pipe assembly heat exchanger for a heat exchange between media of relatively high pressure differentials and a steam drum with a liquid chamber and a steam chamber while the medium passing through the pipes of the pipe assembly-heat exchanger has a high entering temperature, and a pipe bottom located on the inflow side of the hot medium is thin. In the pipe assembly heat exchanger there is furthermore provided a device for relieving the thin pipe bottom. In the pipe assembly-heat exchanger there is also provided a device which is so designed that the cold medium entering the pipe assembly-heat exchanger is conveyed to the thin pipe bottom. The pipes of the pipe assembly-heat exchanger are as an assembly of pipes transversely and centrally passed through the steam drum while the pipe assembly-heat exchanger and the steam drum form a unit with each other. The pipes are at the inflow side of the hot medium by means of the thin pipe bottom connected to the mantle of the pipe assembly-heat exchanger while the pipes in the discharge side of the medium passing through the pipes are through a thin pipe bottom connected to the upper side of the mantle of the steam drum.

What is claimed is: 
     
       1. A pipe assembly heat exchanger-steam drum unit for a heat exchanger between media of relatively high differential pressure, which includes: a steam drum comprising a liquid receiving space with an inlet for liquid under pressure and also comprising a steam receiving space located above said liquid receiving space and provided with an outlet for releasing steam from said steam receiving space, a pipe-assembly-heat exchanger having inlet means and outlet means and having a first relatively thin bottom at one end and a second relatively thin bottom at its other end, said heat exchanger comprising pipes extending in the form of a nest of pipes transversely and substantially centrally through said steam drum and having one end located remote from said drum and connected to said first bottom while communicating with said inlet means for admitting a hot medium therethrough into said pipes, said pipes having another end connected to said second bottom while communicating with said outlet means for releasing said last mentioned medium after it has passed through said steam drum, said pipe assembly heat exchanger and said steam drum forming a unit with each other, and jacket means comprising a first mantle section surrounding said pipes from said steam drum to said first thin bottom and also comprising a second mantle section forming the outer wall of said steam drum and having a surface portion facing away from said inlet means. 
     
     
       2. A unit according to claim 1, which includes a heat exchanger comprising a plurality of nests of pipes and a single steam drum forming a unit therewith. 
     
     
       3. A unit according to claim 1, in which the pipes are under tension-preload. 
     
     
       4. A unit according to claim 1, which includes a cylindrical inner mantle surrounding said pipes and forming a steam-water chamber and together with said first mantle section defining an annular channel, said mantle resting on said first thin bottom and adjacent the latter being provided with said passage means establishing communication between said liquid receiving space outside said inner mantle and said steam-water chamber, said inner mantle also being provided with second passage means adjacent said second thin bottom for establishing communication between said steam-water chamber and said steam receiving space. 
     
     
       5. A unit according to claim 4, in which said first passage means include deflecting means for deflecting liquid received at said first thin bottom into said steam-water chamber. 
     
     
       6. A unit according to claim 5, in which said deflecting means include a circularly shaped guiding plate, two axially extending partitions, and an additonal partition parallel to said guiding plate. 
     
     
       7. A unit according to claim 4, in which said second passage means includes a bulged-out section adjacent said second thin bottom, a circularly shaped guiding plate, and a channel forming section. 
     
     
       8. A unit according to claim 1, in which said inlet means for admitting a hot medium includes a funnel-shaped hood with an inner heat insulating layer covering the rim area of said first thin bottom. 
     
     
       9. A unit according to claim 8, which includes at least one elutriating connection with shut-off valve, said connection being arranged slightly above said rim area in the lower region of said inner mantle and said outer mantle.